Cloud condensation nuclei activity of fresh primary and aged biomass burning aerosol

被引：94

作者：

Engelhart, G. J. ^{[1
]}

Hennigan, C. J. ^{[1
]}

Miracolo, M. A. ^{[1
]}

Robinson, A. L. ^{[1
]}

Pandis, S. N. ^{[1
,2
,3
]}

机构：

[1] Carnegie Mellon Univ, Ctr Atmospher Particle Studies, Pittsburgh, PA 15217 USA

[2] Univ Patras, Dept Chem Engn, Patras, Greece

[3] Fdn Res & Technol, Inst Chem Engn Sci, Patras, Greece

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2012年 / 12卷 / 15期

关键词：

ORGANIC AEROSOL; CCN ACTIVITY; HYGROSCOPICITY; ACTIVATION; PARTICLES; SIZE; EMISSIONS; PHOTOOXIDATION; UNCERTAINTIES; DISTRIBUTIONS;

D O I：

10.5194/acp-12-7285-2012

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

We quantify the hygroscopic properties of particles freshly emitted from biomass burning and after several hours of photochemical aging in a smog chamber. Values of the hygroscopicity parameter, kappa, were calculated from cloud condensation nuclei (CCN) measurements of emissions from combustion of 12 biomass fuels commonly burned in North American wildfires. Prior to photochemical aging, the kappa of the fresh primary aerosol varied widely, between 0.06 (weakly hygroscopic) and 0.6 (highly hygroscopic). The hygroscopicity of the primary aerosol was positively correlated with the inorganic mass fraction of the particles. Photochemical processing reduced the range of kappa values to between 0.08 and 0.3. The changes in kappa were driven by the photochemical production of secondary organic aerosol (SOA). SOA also contributed to growth of particles formed during nucleation events. Analysis of the nucleation mode particles enabled the first direct quantification of the hygroscopicity parameter kappa for biomass burning SOA, which was on average 0.11, similar to values observed for biogenic SOA. Although initial CCN activity of biomass burning aerosol emissions are highly variable, after a few hours of photochemical processing kappa converges to a value of 0.2 +/- 0.1. Therefore, photochemical aging reduces the variability of biomass burning CCN kappa, which should simplify analysis of the potential effects of biomass burning aerosol on climate.

引用

页码：7285 / 7293

页数：9

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